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Publication numberUS5699686 A
Publication typeGrant
Application numberUS 08/600,978
PCT numberPCT/AT1995/000139
Publication dateDec 23, 1997
Filing dateJun 30, 1995
Priority dateJun 30, 1994
Fee statusLapsed
Also published asDE59507333D1, EP0715674A1, EP0715674B1, WO1996000830A1
Publication number08600978, 600978, PCT/1995/139, PCT/AT/1995/000139, PCT/AT/1995/00139, PCT/AT/95/000139, PCT/AT/95/00139, PCT/AT1995/000139, PCT/AT1995/00139, PCT/AT1995000139, PCT/AT199500139, PCT/AT95/000139, PCT/AT95/00139, PCT/AT95000139, PCT/AT9500139, US 5699686 A, US 5699686A, US-A-5699686, US5699686 A, US5699686A
InventorsHarald Neumayer, Roland Krewenka
Original AssigneeEvva-Werk Spezialerzeugung Von Zylinder- Und Sicherheitsschlossern Gesellschaft M.B.H. & Co.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Device for electromagnetically securing a lock barrel
US 5699686 A
Abstract
The device for electromagnetically blocking the closing cylinder (2) of a lock (1) includes a rotary drive comprising a coil (12) and a rotor (7). Depending on the rotary position of the rotor (7), the movable tumbler (4) may be disengaged from the recess (3) of the locking cylinder. In the blocking position, disengagement is prevented by abutment on the end face (11) of the rotor. (FIG. 1 )
Images(3)
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Claims(8)
We claim:
1. A lock comprising a closing cylinder rotatable about a first axis, said closing cylinder having a recess in a circumferential surface thereof; a tumbler movable into and out of said recess along a second axis substantially perpendicular to said first axis and an electromagnetic rotary drive comprising a rotor for allowing movement of said tumbler into and out of said recess, said rotor arranged to rotate about said second axis.
2. A lock according to claim 1, wherein the rotary drive in a defined rotary position enables disengagement of the movable tumbler from said recess in said closing cylinder.
3. A lock according to claim 1, wherein said movable tumbler is formed with cantilevering projections about a circumference thereof, said tumbler resiliently pressed into said recess of the closing cylinder, and wherein an end face of the rotor facing the movable tumbler in a defined rotary position of the rotary drive comprises recesses for receiving said projections.
4. A lock according to claim 3, wherein said end face of the rotor includes recesses in the form of slots for receiving the projections of the movable tumbler.
5. A lock according to claim 1, wherein said recess comprises oblique surfaces by which the movable tumbler is slidingly guided radially outwards as the closing cylinder is rotated upon enabling of a disengagement movement by the rotary drive.
6. A lock according to claim 1, wherein the rotary drive further comprises a stator constituted by a coil elliptically spooled on a generated surface of a cylinder, and wherein said rotor is magnetized in a direction perpendicular to said second axis.
7. A lock according to claim 6, wherein at least one stationarily arranged magnetic element magnetizes the rotor in a defined rotary position absent current at the coil.
8. A lock according to claim 1, wherein a spring is arranged coaxial with the rotor and biases the movable tumbler toward the recess in the closing cylinder.
Description
TECHNICAL FIELD

The invention relates to a device for electromagnetically blocking the closing cylinder of a lock, comprising at least one movable tumbler engaging in a recess provided on the circumference of the closing cylinder.

BACKGROUND

In respect of closing cylinders, there have already become known electronic closing cylinders in which a movable tumbler is placed into a locking position or is disengaged from such locking position by an electromagnetic drive. In a particularly simple manner, an electromagnetic drive in that case may be designed as a lifting drive, such a design yet having the disadvantage of being relatively largely prone to failures. Whenever a movable tumbler is to be actuated by magnetic forces, sufficient movability of the movable tumbler is to be safeguarded and there is the risk of the locking position of such a movable tumbler being released under mechanical influences, for instance by striking at the cylinder, safety thus being no longer ensured.

SUMMARY OF THE INVENTION

The invention aims at providing a device of the initially defined kind, in which safe blocking may be effected by means of an extremely small electromagnetic drive and cannot be readily undone again even under the influence of shocks or other mechanical or electromagnetic actions on the locking cylinder. To solve this object, the device according to the invention essentially consists in that the movable tumbler cooperates with an electromagnetic rotary drive and in its closing position is secured against disengagement from the recess. By providing an electromagnetic rotary drive structurally similar to a conventional small-design motor and by using this rotary drive for preventing the movable tumbler from disengagement from its blocking position in a predetermined rotary position, a high degree of safety is ensured even at slight actuation forces. For, the actuation forces of the rotary drive merely need be adequate to place a support in its operating position, against which the movable tumbler can no longer be moved out. On the other hand, the actuation forces required for unblocking are limited to rotating the rotary drive in a manner that the movable tumbler may re-emerge from a recess into which is has been inserted in its closing position. Thus, the electromagnetic drive causes only the adjustment of a stop shoulder or supporting surface provided for the movable tumbler and, therefore, an extremely small-design and simple rotary drive applying only slight forces will do, but which nevertheless ensures a high degree of safety against mechanical influences. To enable unblocking and the disengagement of the movable tumbler, the configuration advantageously is devised such that the rotary drive enables the disengagement of the movable tumbler from the recess of the closing cylinder in a defined rotary position.

Particularly simple blocking and safe supporting of the movable tumbler may be realized in that the movable tumbler, about its circumference, comprises cantilevering projections or wings or the like and is resiliently pressed into the recess of the blocking cylinder, and that the end face of the rotary drive facing the movable tumbler in a defined rotary position of the rotary drive comprises recesses for receiving said projections or wings. Such a configuration allows for the use of a particularly compact rotary drive, said configuration advantageously being devised such that the rotary drive comprises a stator constituted by a coil spooled on the generated surface of a cylinder in the direction z, and a rotor magnetized in the direction x, in particular a tube- or sleeve-shaped rotor. The tube- or sleeve-shaped design of the rotor allows for the arrangement of a spring for resiliently pressing the movable tumbler and, furthermore, allows said movable tumbler to be pressed into the central cavity of the rotor unless the projections or wings are prevented from immersing into the rotor by an appropriate stop surface.

In order to make the movable tumbler readily evade upon release of the stroke or course of the movable tumbler against the force of a spring, the configuration advantageously is devised such that the recess comprises oblique surfaces on the circumference of the closing cylinder, via which the movable tumbler is slidingly guided radially outwards as the closing cylinder is rotated upon enabling of the disengagement movement by the rotary drive. Such a configuration causes the movable tumbler to be slidingly pressed outwards via the oblique surfaces with the movable tumbler being able to immerse into the interior of the sleeve- or tube-shaped rotor and the wings or projections being able to immerse into respective recesses provided on the end side of the rotor.

In order to offer, with such a configuration, the additional advantage of automatically assuming a defined starting position as the device gets currentless again, the configuration advantageously is devised such that at least one stationarily arranged element magnetic in the longitudinal direction, e.g., a ferrite, is provided in addition, setting the magnetized rotor in a defined rotary position in the absence of current at the coil. Such a configuration, upon resilient readjustment of the movable tumbler into its blocked position, allows for the automatic rotation of the rotor into a defined starting position, in which the stop surfaces again enter into effect with a view to supporting the projections or wings of the movable tumbler, thus preventing further rotation of the closing cylinder, since from then on the movable tumbler cannot evade any more.

As already mentioned, the configuration in an advantageous manner is devised such that the end face of the rotor includes recesses in the form of slots for receiving the projections or wings of the movable tumbler, wherein such recesses may, for instance, be designed in the manner of screw driver grooves matching in contour with corresponding plug wings in order to enable the evasion of the plug in the respective rotary position of the rotor. As further pointed out in the beginning, it is feasible, in particular due to the tube- or sleeve-shaped design of the rotor, to arrange a spring in the interior of the rotor coaxial therewith such that, on the whole, a particularly compact and simple construction is provided, which may readily be installed in a conventional lock of usual contour. Thus, blocking is effected by a rotary drive causing two or four connections. With two connections, rotation by 90° from the resting position is provided in consideration of the given field lines, wherein the rotor will orient itself in accordance with a rigidly arranged magnetic part, e.g., ferrite, as the coil is no longer passed by current. When using more than one ferrite, also a bistable state may be obtained, in which one of two possible end positions may be assumed facultatively, which end position renders feasible either the release or the blocking of the movement of the locking plug. When using a coil having four poles offset by 90°, with opposite poles each belonging together, the field of the ferrite need not be overcome for rotary movement. However, in that case constant current is required since there will be no stable resting position at a power breakdown.

A particular advantage of the configuration according to the invention consists in that external influence or manipulation appears to be hardly possible on account of the rotary movement demanded from the supporting surfaces. Moreover, hardly moved parts cause little wear of the structural components, each of which structural components, due to the particularly slight number of structural components, even may be realized accordingly more sturdy.

In the following, the invention will be explained in more detail by way of exemplary embodiments schematically illustrated in the drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a lock comprising the electromagnetic blocking device according to the invention;

FIG. 2 shows a detail of FIG. 1 viewed in the direction of arrow II;

FIG. 3 is an illustration analogous to FIG. 1 with the rotor rotated by 90°;

FIG. 4 is a partial view according to arrow IV of FIG. 3;

FIG. 5, FIG. 6 and FIG. 7 depict variants of the configuration using a ferrite for automatically assuming a defined starting position in the absence of current at the coil.

DETAILED DESCRIPTION OF THE DRAWINGS

From FIG. 1 a lock 1 is apparent, whose closing cylinder 2 on its circumference has a recess 3 for receiving a movable tumbler 4. The movable tumbler 4 is inserted in the recess 3 by the force of the spring 5. The recess 3 has oblique surfaces 6 cooperating with the movable tumbler 4. If the rotor 7 of the electromotor 8 is in the position represented in FIG. 1, evasion of the movable tumbler 4 into the hollow space 9 of the rotor 7 is impeded, since the lateral projections or wings 10 of the movable tumbler 4 collide with the end face 11 of the rotor 7. The coil of the electromotor 8 is indicated by 12, the windings of the coil being effected in the direction of the axis z. The rotor 7 is magnetized in the direction of the axis x, rotation of the rotor upon current feed thus taking place in the sense of arrow 13.

From the illustration according to FIG. 2, it is apparent that the end face 11 of the rotor 7 has recesses 14 in which the wings or lateral projections 10 of the movable tumbler 4 may engage upon appropriate rotation of the rotor 7 in the direction of arrow 13. In FIGS. 1 and 2, a stationary ferrite 15 is additionally visible, which causes the rotor 7 to rotate into a defined starting position in the absence of current at the coil 12.

In the illustrations according to FIGS. 3 and 4, a position rotated by 90° is each visible, which position will be assumed if current is flowing through the coil 12. As is apparent, in particular, from FIG. 3, the lateral projections 10 of the movable tumbler 4 are able to immerse into the recesses 14 of the rotor 7 in that rotary position with the force of the spring 5 having to be overcome. When turning the blocking cylinder in the direction of double arrow 16, the oblique surfaces 6 will act on the movable tumbler 4 in the sense of an axial displacement in the direction of double arrow 17 so as to enable the engagement of the movable tumbler 4 in the central axial hollow space 9 of the rotor. The respective side view according to arrow IV, on the coil and rotor again is represented in FIG. 4.

From the illustrations according to FIGS. 5, 6 and 7, different arrangements of ferrites 15 can each be taken. The magnetizing direction of the rotor in those cases corresponds to one of the arrows 18, depending on whether the coil 12 is currentless or not. In the representation according to FIG. 7, bistable blocking is feasible, one of the two positions indicated by arrows 18 being assumed in the absence of current. The end points of the ferrites each lie beyond the poles of the coils. With the configuration according to FIG. 7, the coil merely is used for switching over from one stable position into the other, whereby a particularly low current consumption is achieved, since constant current feed is no longer necessary. With the configurations according to FIGS. 5 and 6, a suitable constant current is each required for blocking or unblocking.

Patent Citations
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US3935720 *Oct 24, 1974Feb 3, 1976Egon BovingRotatable cylinder lock
US3967846 *Apr 8, 1974Jul 6, 1976Schlage Lock CompanyLock
US4625848 *Nov 14, 1983Dec 2, 1986Pierre MeyersLock device
US5010750 *Jan 31, 1990Apr 30, 1991Dom-Sicherheitstechnik Gmbh & Co. KgLock cylinder with electromagnetic tumbler
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*DE3902992A Title not available
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FR2249228A1 * Title not available
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5839305 *Sep 4, 1995Nov 24, 1998Yale Security Products LimitedElectrically operable cylinder lock
US5839307 *Jun 13, 1997Nov 24, 1998Medeco Security Locks, Inc.Electromechanical cylinder lock with rotary release
US6035675 *Jan 20, 1998Mar 14, 2000Daimler Benz AktiengesellschaftElectromagnetically actuated lock
US6227020 *Feb 18, 1999May 8, 2001Keso GmbhLocking device
US6363762 *Dec 8, 1997Apr 2, 2002Kaba Schliessysteme AgLocking device
US6442986 *Apr 7, 1999Sep 3, 2002Best Lock CorporationElectronic token and lock core
US6474120 *Feb 24, 1999Nov 5, 2002Eja Engineering LimitedBolt assembly
US6499325 *Feb 18, 2000Dec 31, 2002Abloy OyElectromechanical actuator
US6523377 *Aug 10, 2000Feb 25, 2003Berchtold AgBlocking device for a cylinder lock
US20100313615 *Jun 15, 2009Dec 16, 2010Hwan Ming Enterprise Co., Ltd.Electronic Lock
US20130061644 *Sep 6, 2012Mar 14, 2013Medeco Security Locks, Inc.Apparatus for automatically returning a lock to a desired orientation
DE102004013196B3 *Mar 17, 2004Jul 7, 2005TST Tresor- und Schloßtechnik GmbHLock unit for electronic high security lock requiring input of electronic identifcation signals for release of blocking slider to permit movement of locking pins into released position
EP1030010A2 *Feb 21, 2000Aug 23, 2000Abloy OyElectromechanical actuator
EP1164238A1 *May 21, 2001Dec 19, 2001Kaba Gege GmbHCylinder lock
WO2007049040A1 *Oct 25, 2006May 3, 2007Pbt Ip LtdLow power lock mechanism
Classifications
U.S. Classification70/283, 70/276
International ClassificationE05B27/00, E05B47/00, E05B47/06
Cooperative ClassificationE05B47/0005, E05B47/0012, E05B47/063
European ClassificationE05B47/06C4R1
Legal Events
DateCodeEventDescription
Feb 21, 2006FPExpired due to failure to pay maintenance fee
Effective date: 20051223
Dec 23, 2005LAPSLapse for failure to pay maintenance fees
Jul 13, 2005REMIMaintenance fee reminder mailed
May 29, 2001FPAYFee payment
Year of fee payment: 4
Feb 22, 1996ASAssignment
Owner name: EVVA-WERK SPEZIALERZEUGUNG VON ZYLINDER-UND SICHER
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NEUMAYER, HARALD;KREWENKA, ROLAND;REEL/FRAME:007913/0734
Effective date: 19960207